HI

So the question is quite incomplete i guess. There are a lot of factors obivious one is reservation and home qouta,branch etc. The huge benefit of getting into a good NIT is that if your income is less than 5 lac then 2/3 of your fees will be waive off. If your parents income is less than 1 lakh per annum then the entire fees is waive off. So if you are from gen category then you must get above 150 in jee mains. OBC candidates would require 125 and Sc would 100

If you score above 190 u get the best branches in best nit and even IIT 

And with 50 percentile its quit difficult  get into iit Bhubaneswar and also you must consider this point when that

 A score above 75 percent in boards.if you want to get any NIT or IIT 

GOOD LUCK

Dear Aspirant, at this percentile your AIR would be around 4,37,000. At this AIR it would be impossible to get admission into NITS and IIITS. It would be better you look out for other colleges by giving college specific exams like BITSAT, VITEE, etc.